HomeMy WebLinkAbout16.a. General Manager Written Announcements Page 1 of 2
Item 16.a.
Af Ahm=
CENTRALSAN
CENTRAL CONTRA COSTA SANITARY DISTRICT
May 6, 2021
TO: HONORABLE BOARD OF DIRECTORS
FROM: ROGER S. BAILEY, GENERAL MANAGER
SUBJECT: ANNOUNCEMENTS - MAY6, 2021
Attached are the announcements for the above meeting.
ATTACHMENTS:
1. General Manager Written Announcements
May 6, 2021 Regular Board Meeting Agenda Packet- Page 183 of 239
Page 2 of 2
ATTACHMENT 1
Board Meeting of May 6, 2021
General Manager Written Announcements
PROJECT UPDATES
1) Public Bidding of Electric Blowers Improvements, District Project (DP) 100015
and Treatment Plant Piping Renovations, Phase 10, DP 7369
Based on the similar nature of the work and common project sites, staff decided to combine
the following two projects into one construction package for public bid and execution with
one general contractor.
Electric Blower Improvements: The aeration system is one of the most critical processes
at the wastewater treatment plant (plant). The existing aeration blowers supply air to four
aeration basins, pre-aeration before the primary sedimentation tanks, and other plant
systems.
The findings of a recent condition assessment and capacity analysis indicated the existing
electric blower does not provide adequate redundancy, has uncertain reliability with the
standby power generation system, has limited turndown capabilities, and cannot be
operated in parallel with the large steam blowers. Three new, pre-purchased electric
blowers will provide the needed reliability and capability to run with other equipment during
PG&E Public Safety Power Shutoffs events. In addition, these blowers will provide the
necessary air to the plant while equipment is offline during planned shutdowns as part of
the Solids Handling Facility Improvements project.
Treatment Plant Piping Renovations, Phase 10: Many of the plant's piping and related
systems have been in place for nearly forty-plus years. Failures of the piping systems
reduce reliability and can adversely impact the treatment process. The scope and phases
for the piping renovation program are identified by Operations and Capital Projects staff on
an annual basis and intended to cover the replacement items that are not included in other
capital projects.
The project will renovate and/or replace various piping, instrumentation, and equipment in
the plant and includes a variety of necessary modifications, such as replacement of the
secondary scum piping system, replacement and improvements to the sodium
hypochlorite injection system, and several improvements to the potable water system.
Lastly, this phase will also replace several electrical equipment at the end of its useful life,
such as the variable frequency drives for pumps and other equipment.
The combined bid package will be advertised on May 10 and 17, with a scheduled bid
opening on June 17, 2021. The Engineer's estimate is $13.8 million for the two projects.
More information will be presented when the Board is asked to award the construction
contract in July.
May 6, 2021 Regular Board Meeting Agenda Packet- Page 184 of 239